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{
  "name": "B-Mo iron ore statistical engine",
  "version": 1,
  "created_utc": "2026-11-14T18:32:54+00:00",
  "trained_on_fake_data": false,
  "training": {
    "deposits": 975,
    "background": 1950,
    "exact_only": false,
    "imagery_window": [
      "2024-01-01",
      "2025-12-31"
    ],
    "buffer_m": 500,
    "composite": "median; Sentinel-2 SCL-masked; Landsat QA_PIXEL-masked",
    "background_rule": "25.0-300.0 km from a deposit, on land, 50% on bare/sparse ground"
  },
  "validation": {
    "engine_model": "Statistical engine (likelihood variant)",
    "scheme": "spatial CV, 10-degree blocks",
    "engine_cv_roc_auc": 0.7816005259697567,
    "engine_deposits_found_at_10pct_false_alarms": 0.4164102564102564,
    "best_ml_model": "XGBoost",
    "best_ml_feature_set": "+terrain",
    "best_ml_cv_roc_auc": 0.8577130834976988
  },
  "feature_set": "+terrain",
  "engine_mode": "likelihood",
  "scoring": {
    "closeness": {
      "per_feature": "s = exp(-0.5*((x-mean)/std)^2)",
      "combine": "weighted average over available features, x100"
    },
    "likelihood": {
      "per_feature": "llr = clip(log N(x|deposit mean,std) - log N(x|background mean,std), -10, 10)",
      "combine": "S = sum(llr * weight/max_weight) over available features; score = 100/(1+exp(-S/llr_scale))",
      "llr_scale": 16.70671964821434
    },
    "mode_used_below": "likelihood",
    "class_names": [
      "Very low",
      "Low",
      "Moderate",
      "High",
      "Very high"
    ],
    "class_edges_score": [
      49.09511078426455,
      56.82105322793868,
      58.531284836870356,
      59.582799025505466
    ],
    "class_edges_note": "background percentiles 50/75/90/97 of out-of-fold engine scores"
  },
  "features": {
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      "definition": "Sentinel-2 L2A blue reflectance",
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      "background_std": 0.053489586861614216
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    "B3": {
      "definition": "green",
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    "B4": {
      "definition": "red",
      "mean": 0.10678930898259474,
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      "weight": 0.07227970468694157,
      "auc": 0.3086337935568705,
      "background_mean": 0.1791886566811235,
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    },
    "B8": {
      "definition": "NIR",
      "mean": 0.2066286780458844,
      "std": 0.05479076284351166,
      "weight": 0.10547153202539121,
      "auc": 0.2207558185404339,
      "background_mean": 0.28083064969382937,
      "background_std": 0.08412121715135522
    },
    "B11": {
      "definition": "SWIR1",
      "mean": 0.2232268534016476,
      "std": 0.05935811691843387,
      "weight": 0.09199856408068086,
      "auc": 0.2564265614727153,
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    },
    "B12": {
      "definition": "SWIR2",
      "mean": 0.17152643179863386,
      "std": 0.06228796575799113,
      "weight": 0.07561084679309032,
      "auc": 0.29981433267587115,
      "background_mean": 0.2625244268812584,
      "background_std": 0.13682707644577247
    },
    "ferric_oxide": {
      "definition": "B4/B2",
      "mean": 1.7176617484216212,
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      "weight": 0.013171997030420303,
      "auc": 0.4651261012491782,
      "background_mean": 1.7710890561231676,
      "background_std": 0.46884217335533934
    },
    "iron_nd": {
      "definition": "(B4-B2)/(B4+B2)",
      "mean": 0.24384875365667089,
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      "weight": 0.013171997030420303,
      "auc": 0.4651261012491782,
      "background_mean": 0.25998377101913095,
      "background_std": 0.11109186357768336
    },
    "ferrous_iron": {
      "definition": "B11/B8",
      "mean": 1.1241934255846506,
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      "weight": 0.013681561647683646,
      "auc": 0.46377698882314267,
      "background_mean": 1.1272594819384358,
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    },
    "gossan": {
      "definition": "B11/B4",
      "mean": 2.3338582318033865,
      "std": 0.8058257408752163,
      "weight": 0.031107082272733705,
      "auc": 0.5823584483892177,
      "background_mean": 2.1964458674116774,
      "background_std": 0.9367066579105208
    },
    "clay": {
      "definition": "B11/B12",
      "mean": 1.3653041082336972,
      "std": 0.27431759757551355,
      "weight": 0.026390281996833756,
      "auc": 0.5698703484549639,
      "background_mean": 1.3268596778439787,
      "background_std": 0.3015878904386062
    },
    "ndvi": {
      "definition": "(B8-B4)/(B8+B4)",
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      "weight": 0.030564539984333634,
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      "background_mean": 0.27460847190290455,
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    "bsi": {
      "definition": "((B11+B4)-(B8+B2))/((B11+B4)+(B8+B2))",
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    "brightness": {
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    "ST_p10": {
      "definition": "Landsat 8/9 ST_B10 (K) 10th percentile",
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    "ST_p50": {
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      "background_mean": 306.16192286022414,
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    "ST_p90": {
      "definition": "90th percentile",
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      "auc": 0.33905115055884283,
      "background_mean": 318.7641870628457,
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    "lst_range": {
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      "auc": 0.358043392504931,
      "background_mean": 28.53988443384614,
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    "elevation": {
      "definition": "ALOS AW3D30 DSM (m)",
      "mean": 674.3253105301035,
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      "weight": 0.014158843906153495,
      "auc": 0.46251334648257725,
      "background_mean": 868.5084454493264,
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    },
    "slope": {
      "definition": "degrees from ALOS DSM",
      "mean": 12.17532829961761,
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      "weight": 0.08810928482357644,
      "auc": 0.7332762656147273,
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  }
}